Testing device for detecting tensile property of cable

Abstract

The invention relates to the technical field of tensile testing, in particular to a testing device for detecting the tensile property of a cable. Aiming at the defects that the tensile length of a cable after tensile fracture is difficult to measure and errors may exist in manual measurement, the invention provides a testing device for detecting the tensile property of the cable, the testing device comprises a stretcher, a sliding plate is connected to the stretcher in a sliding manner, and the stretcher automatically controls the sliding plate to slide through a control system in the stretcher. The stretcher and the sliding plate are fixedly connected with calipers used for fixing the two ends of a cable to be tested, the stretcher is fixedly connected with fixing rods symmetrically distributed along the stretcher, and a position measuring plate is slidably connected between the symmetrically distributed fixing rods. The stretching characteristics of different cables can be tested through the stretching machine, the calipers and the sliding plate, the length of the stretched cables can be automatically measured and calculated through cooperation of the position measuring plate, the laser length measuring sensor and other components, operation is easy and convenient, measurement and calculation are more accurate, and follow-up calculation of the stretching rate is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile testing, and particularly relates to a testing device for detecting the tensile characteristics of cable wires. Background Art

[0002] During the production process of cable wires, in order to ensure that the product quality meets the relevant national standards, special testing devices are required to detect the tensile characteristics of cable wires, so as to evaluate the mechanical properties such as the tensile rate and tensile strength of cable products such as BV wires. By measuring the deformation degree of the cable under force and the maximum tensile force it can withstand, it is thus verified whether it meets the requirements of the national standards, ensuring the safety and reliability of the cable in actual applications.

[0003] During the process of testing the tensile characteristics of cable wires, existing tensile testing machines usually only have simple maximum tensile force testing and tensile force control testing functions. Such devices are rather limited when measuring the tensile value because they cannot directly and real-time record the length change of the cable wire during the force application process. When calculating according to the formula of tensile rate (A) = (length after stretching - original length) / original length × 100%, the operator needs to manually remove the two disconnected sections of the cable wire after stretching and measure their lengths respectively to obtain the length after stretching, and then calculate the tensile rate. This method not only increases the operation steps, making the entire measurement process cumbersome, but also affects the accuracy of the final data due to possible errors in the manual measurement and data processing process. Summary of the Invention

[0004] In order to overcome the disadvantages that it is not easy to measure the tensile length after the cable wire is stretched and broken and there may be errors in manual measurement, the present invention provides a testing device for detecting the tensile characteristics of cable wires.

[0005] A testing device for detecting the tensile characteristics of cable wires includes a tensile testing machine. A sliding plate is slidably connected to the tensile testing machine. The tensile testing machine automatically controls the sliding of the sliding plate through its internal control system. Clamps for fixing both ends of the cable wire to be tested are fixedly connected to both the tensile testing machine and the sliding plate. The tensile testing machine is fixedly connected with fixing rods symmetrically distributed along the tensile testing machine. A measuring plate is slidably connected between the symmetrically distributed fixing rods. Scale lines for measuring the length of the cable wire are marked between both ends of the measuring plate. Initially, only one end of the cable wire is aligned with the end scale line of the measuring plate. A groove is opened on one side of the measuring plate close to the scale line. A laser length measuring sensor for measuring the length between the break points of the cable wire is fixedly connected to the middle of the measuring plate. A force-bearing frame for pushing the measuring plate to move towards the cable wire side after the cable wire is stretched is slidably connected to the tensile testing machine. The sliding plate slides and contacts the force-bearing frame. A first spring is fixedly connected between the fixing rod and the measuring plate. A transparent supporting plate is arranged in the groove of the measuring plate, and the supporting plate is used to support the cable wire.

[0006] As a preferred technical solution of the present invention, the positioning plate is provided with inclined holes symmetrically distributed along the positioning plate, and the positioning plate is slidably connected to the stress-bearing frame through the inclined holes thereon.

[0007] As a preferred technical solution of the present invention, it further includes a pulling frame, the pulling frame is slidably connected to the positioning plate, the pulling frame is fixedly connected to the support plate, the pulling frame is slidably connected with a magnetic plate, the magnetic plate moves under the extrusion of the cable, and a reset member for resetting the support plate after the laser length measuring sensor completes length measurement is provided on the caliper close to the skateboard side.

[0008] As a preferred technical solution of the present invention, the reset member is provided as magnetic blocks symmetrically distributed along the magnetic plate, the magnetic blocks are fixedly connected to the caliper close to the skateboard side, and the magnetic blocks are magnetically coupled with the magnetic plate.

[0009] As a preferred technical solution of the present invention, it further includes friction blocks symmetrically distributed along the positioning plate, the friction blocks are slidably connected to the positioning plate, the friction blocks are in frictional cooperation with the pulling frame, and a compressed second spring is fixedly connected between the friction blocks and the positioning plate.

[0010] As a preferred technical solution of the present invention, it further includes fixing plates symmetrically distributed along the positioning plate, a transparent limiting plate is rotatably connected between the symmetrically distributed fixing plates, a torsion spring is fixedly connected between the fixing plates and the limiting plate, a pulling plate and an L-shaped pull rod are slidably connected to the positioning plate, the pulling plate and the L-shaped pull rod are slidably connected, the pulling plate contacts the limiting plate, the L-shaped pull rod moves to contact the stress-bearing frame, and a pulling spring is fixedly connected between the L-shaped pull rod and the positioning plate.

[0011] As a preferred technical solution of the present invention, the side of the pulling plate close to the L-shaped pull rod is provided with inclined holes symmetrically distributed along the L-shaped pull rod, and the pulling plate is slidably connected to the L-shaped pull rod through the inclined holes thereon.

[0012] As a preferred technical solution of the present invention, it further includes a wire winder, the wire winder is fixedly connected to the limiting plate, wire ropes symmetrically distributed along the wire winder are fixedly connected to the wire winder, combing blocks symmetrically distributed along the limiting plate are slidably connected to the limiting plate, the combing blocks are fixedly connected to the wire ropes adjacent to the wire winder, and an elastic rope is fixedly connected between the combing blocks and the limiting plate.

[0013] As a preferred technical solution of the present invention, it further includes a positioning rod, the positioning rod is fixedly connected to the caliper close to the skateboard side, the positioning rod points to the scale line of the positioning plate, and the positioning rod is used to intuitively observe the original length of the cable.

[0014] Beneficial effects: The present invention can test the tensile properties of different cables through a stretching machine, calipers and a skateboard, and through the cooperation of components such as a positioning plate and a laser length measuring sensor, it can also automatically calculate the length of the cable after stretching, with simple operation and more accurate calculation, which is convenient for subsequent calculation of the elongation rate.

[0015] In the present invention, the magnetic plate retreats adaptively according to the thickness of the cable, thereby driving the pulling frame to slide backward. The pulling frame pulls the supporting plate to retreat synchronously by the same distance. In this way, the position of the supporting plate can be adapted to the thickness of the cable, enabling the cable to be better straightened by the supporting plate.

[0016] In the present invention, the magnetic block and the magnetic plate are magnetically attracted and cooperated with each other. Thus, after measuring the length between the broken ends of the cable, the supporting plate can be reset to prevent the supporting plate from being reset during breakage, which may push the broken cable forward and cause distortion, thereby affecting the measurement.

[0017] In the present invention, the elastic force of the compressed second spring acts on the friction block in the opposite direction, causing the friction block to tightly adhere to the pulling frame, increasing the friction force between the pulling frame and the friction block, and preventing the pulling frame from sliding forward and backward easily under a small force, which may affect the above adjustment operation.

[0018] During the forward movement of the position measuring plate in the present invention, the limiting plate is toggled to the right by the pulling plate, causing the limiting plate to rotate counterclockwise relative to the fixed plate until it contacts the front side of the cable, so as to limit the front side of the cable and prevent the cable from popping forward when it breaks, further ensuring the accuracy of the measurement.

[0019] In the present invention, the cable can be straightened by the combing block during sliding, preventing the cable from being distorted and affecting the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 is a three-dimensional structural schematic diagram of components such as the position measuring plate, force receiving frame, and first spring of the present invention.

[0022] Figure 3 is a three-dimensional structural schematic diagram of components such as the magnetic plate, magnetic block, and friction block of the present invention.

[0023] Figure 4 is a three-dimensional structural schematic diagram of components such as the supporting plate, pulling frame, and friction block of the present invention.

[0024] Figure 5 is a three-dimensional structural schematic diagram of components such as the pulling frame, friction block, and second spring of the present invention.

[0025] Figure 6 is a three-dimensional structural schematic diagram of components such as the fixed plate, limiting plate, and torsion spring of the present invention.

[0026] Figure 7 is a three-dimensional structural schematic diagram of components such as the pulling plate, L-shaped pull rod, and tension spring of the present invention.

[0027] Figure 8 is a three-dimensional structural schematic diagram of components such as the limiting plate, wire winder, and combing block of the present invention.

[0028] Figure 9 This is a schematic three-dimensional structure diagram of the reel, carding block and elastic cord of the present invention.

[0029] Figure 10 This is a schematic three-dimensional structure diagram of the caliper, position measuring plate and positioning rod of the present invention.

[0030] The markings in the figure are: 1 - stretching machine, 2 - sliding plate, 3 - caliper, 301 - cable, 4 - fixing rod, 5 - position measuring plate, 501 - laser length measuring sensor, 6 - force-bearing frame, 7 - first spring, 8 - support plate, 9 - pulling frame, 10 - magnetic plate, 11 - magnetic block, 12 - friction block, 13 - second spring, 14 - fixing plate, 15 - limiting plate, 16 - torsion spring, 17 - pulling plate, 18 - L-shaped pull rod, 19 - pulling spring, 20 - reel, 21 - carding block, 22 - elastic cord, 23 - positioning rod. Detailed implementation manners

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners, but the protection scope and application scope of the present invention are not limited.

[0032] Embodiment 1: A test device for detecting the stretching characteristics of a cable, as Figures 1 - 3 shown, includes a stretching machine 1. A sliding plate 2 is slidably connected to the lower part of the stretching machine 1 in the up and down direction. The stretching machine 1 automatically controls the up and down sliding of the sliding plate 2 through its internal control system. Calipers 3 are fixedly connected to both the stretching machine 1 and the sliding plate 2. The upper and lower two calipers 3 are respectively used to fix the upper and lower ends of the cable 301 to be tested. A fixing rod 4 symmetrically distributed along the left and right of the stretching machine 1 is fixedly connected to the rear side of the middle part of the stretching machine 1. A position measuring plate 5 is slidably connected between the symmetrically distributed fixing rods 4 along the front and back direction. Oblique holes symmetrically distributed along the left and right of the position measuring plate 5 are opened on the position measuring plate 5. Scale lines for measuring the length of the cable 301 are marked between the upper and lower ends of the position measuring plate 5. Initially, only the upper end of the cable 301 is aligned with the upper end scale line of the position measuring plate 5. A groove is opened on one side of the position measuring plate 5 close to the scale line. A laser length measuring sensor 501 is fixedly connected to the middle part of the position measuring plate 5. The laser length measuring sensor 501 is used to measure the length between the break points of the cable 301 after the middle of the cable 301 is broken. A force-bearing frame 6 is slidably connected to the rear side of the stretching machine 1 in the up and down direction. The position measuring plate 5 is slidably connected to the force-bearing frame 6 through the oblique holes on it. The force-bearing frame 6 is used to push the position measuring plate 5 forward to approach the cable 301 after the cable 301 is stretched. The sliding plate 2 slides down to contact the lower part of the force-bearing frame 6. A first spring 7 is fixedly connected between the fixing rod 4 and the position measuring plate 5. A transparent support plate 8 is arranged in the groove of the position measuring plate 5. The support plate 8 supports the rear side of the cable 301.

[0033] When using this test device for tensile testing, first, the stretching machine 1 automatically controls the downward movement of the slide plate 2 to the initial position as shown in Figure 1 and calculates the initial downward movement distance, so as to determine the initial distance between the upper and lower calipers 3. Subsequently, each time a cable 301 to be tested with the same length is intercepted, and the upper and lower ends of the cable 301 are respectively fixed on the upper and lower calipers 3, thus determining the original length of the cable 301. Next, control the stretching machine 1 to make the slide plate 2 drive the lower caliper 3 to move downward. During the downward movement, the cable 301 is stretched. After being stretched to a certain extent, the slide plate 2 first moves downward to contact the lower part of the force-bearing frame 6, and then the slide plate 2 drives the force-bearing frame 6 to move downward. The force-bearing frame 6 squeezes the measuring plate 5 along the fixed rod 4 to slide forward through the inclined hole, and the first spring 7 is compressed, so that the measuring plate 5 drives the support plate 8 to move forward to contact the cable 301. At this time, the lower caliper 3 moves downward to the limit (the lowermost side of the measuring plate 5). The stretched cable 301 may break before the lower caliper 3 moves downward to the limit. Then, the length between the broken ends of the cable 301 is detected by the laser length measuring sensor 501, and the length of the stretched cable 301 is obtained by subtracting the length measured by the laser length measuring sensor 501 from the length of the measuring plate 5. The stretched cable 301 may also not break when the lower caliper 3 moves downward to the limit, then the length of the measuring plate 5 is the length of the stretched cable 301. Finally, remove the cable 301, control the stretching machine 1 to make the slide plate 2 drive the lower caliper 3 to move upward to reset, the first spring 7 resets, the measuring plate 5 slides backward along the fixed rod 4 to reset, and the measuring plate 5 squeezes the force-bearing frame 6 to move upward to reset through the inclined hole on it.

[0034] In summary, the present invention can test the tensile properties of different cables 301 through the stretching machine 1, the calipers 3 and the slide plate 2. Moreover, through the cooperation of components such as the measuring plate 5 and the laser length measuring sensor 501, the length of the cable 301 after stretching can be automatically calculated. The operation is simple and the calculation is more accurate, which is convenient for subsequent calculation of the elongation rate.

[0035] Example 2: On the basis of Example 1, as shown in Figures 3 - 5As shown, it further includes an elastic support 9. The elastic support 9 is slidably connected to the position measuring plate 5. The rear side of the elastic support 9 is fixedly connected to the support plate 8. The front side of the elastic support 9 is slidably connected with a magnetic plate 10 in the vertical direction. The magnetic plate 10 moves backward under the extrusion of the cable 301. A magnetic block 11 symmetrically distributed along the left and right of the magnetic plate 10 is fixedly connected to the lower caliper 3. The magnetic block 11 is magnetically attracted to the magnetic plate 10, so that after the laser length measuring sensor 501 completes the length measurement, the magnetic plate 10 drives the support plate 8 to move forward and reset through the elastic support 9. A friction block 12 symmetrically distributed along the left and right of the position measuring plate 5 is slidably connected to the middle of the position measuring plate 5 in the left and right direction. The friction block 12 is in frictional cooperation with the elastic support 9. A compressed second spring 13 is fixedly connected between the friction block 12 and the position measuring plate 5.

[0036] In order to enable the position of the support plate 8 to adapt to the thickness of the cable 301, so that the cable 301 can be better straightened by the support plate 8, it is realized through the following specific operations: When the lower end of the cable 301 is fixed to the lower caliper 3, the magnetic plate 10 retreats adaptively backward due to the thickness of the cable 301, thereby driving the elastic support 9 to slide backward. The elastic support 9 drives the support plate 8 to retreat synchronously by the same distance. In this way, the position of the support plate 8 can be adapted to the thickness of the cable 301. When the lower caliper 3 stretches the cable 301, the magnetic block 11 drives the magnetic plate 10 to slide downward along the elastic support 9 through magnetic attraction. When the magnetic plate 10 slides downward to the lowest side of the elastic support 9, the magnetic plate 10 stops moving downward, and the lower caliper 3 drives the magnetic block 11 to continue moving downward.

[0037] After the laser length measuring sensor 501 completes the length measurement, the cable 301 is removed. The lower caliper 3 drives the magnetic block 11 to move upward. During this process, the magnetic block 11 moves upward to the same height as the magnetic plate 10. The magnetic plate 10 adsorbs the magnetic plate 10 to move forward through magnetic force, thereby driving the elastic support 9 to slide forward, and further driving the support plate 8 to move forward and reset. In this way, after measuring the length between the broken ends of the cable 301, the support plate 8 can be reset, preventing the support plate 8 from resetting during the break, which may push the broken cable 301 forward and cause it to be crooked, thus affecting the measurement.

[0038] In addition, in the present invention, the elastic force of the compressed second spring 13 acts on the friction block 12 in the opposite direction, so that the friction block 12 is tightly attached to the elastic support 9, increasing the friction force between the elastic support 9 and the friction block 12, and preventing the elastic support 9 from sliding forward and backward easily under a small force, which may affect the above adjustment operations.

[0039] Such as Figure 6 and Figure 7As shown in the figure, it further includes fixing plates 14 symmetrically distributed up and down along the positioning plate 5. A transparent limiting plate 15 is rotatably connected between the fixing plates 14 symmetrically distributed up and down. A torsion spring 16 is fixedly connected between the fixing plate 14 and the limiting plate 15. A pulling plate 17 is slidably connected to the right part of the positioning plate 5 in the left-right direction. The pulling plate 17 contacts the limiting plate 15. When the pulling plate 17 moves to the right, it pulls the limiting plate 15 to rotate. An L-shaped pull rod 18 is slidably connected to the right part of the positioning plate 5 in the front-back direction. Oblique holes symmetrically distributed up and down along the L-shaped pull rod 18 are formed on the right side of the pulling plate 17. The pulling plate 17 is slidably connected to the L-shaped pull rod 18 through the oblique holes on it. The rear part of the L-shaped pull rod 18 moves forward to contact the force-bearing frame 6. After that, the L-shaped pull rod 18 cannot continue to move forward. The pulling plate 17 continues to move forward relative to the L-shaped pull rod 18 and starts to move to the right. A tension spring 19 is fixedly connected between the L-shaped pull rod 18 and the positioning plate 5.

[0040] During the forward movement of the positioning plate 5, the positioning plate 5 drives the pulling plate 17, the L-shaped pull rod 18 and the tension spring 19 on it to move forward as a whole. When the upper part of the L-shaped pull rod 18 contacts the force-bearing frame 6 during the forward movement, the L-shaped pull rod 18 stops moving forward. The positioning plate 5 drives the pulling plate 17 to continue moving forward. During the process of the pulling plate 17 moving forward relative to the L-shaped pull rod 18, the oblique holes on itself are also guided by the L-shaped pull rod 18, so that the pulling plate 17 also moves to the right relative to the L-shaped pull rod 18. In this way, the pulling plate 17 toggles the limiting plate 15 to the right, so that the limiting plate 15 rotates relative to the fixing plate 14 until it contacts the front side of the cable 301, so as to limit the front side of the cable 301 and prevent the cable 301 from popping forward when it breaks, further ensuring the accuracy of the measurement.

[0041] As Figure 8 and Figure 9 shown in the figure, it further includes a wire reel 20. The wire reel 20 is fixedly connected to the middle part of the limiting plate 15. Pulling wires symmetrically distributed up and down along the wire reel 20 are fixedly connected to the wire reel 20. Combing blocks 21 symmetrically distributed up and down along the limiting plate 15 are slidably connected to the left side of the limiting plate 15 in the up-down direction. The combing blocks 21 are fixedly connected to the pulling wires adjacent to the wire reel 20. An elastic cord 22 is fixedly connected between the combing blocks 21 and the limiting plate 15.

[0042] When the limiting plate 15 rotates relative to the fixing plate 14 until it contacts the front side of the cable 301, the combing blocks 21 enclose the cable 301. Immediately, the wire reel 20 is quickly controlled to wind up the pulling wires on it, so that the combing blocks 21 slide on the limiting plate 15, and the elastic cord 22 is stretched. The combing blocks 21 can straighten the cable 301 during the sliding process to prevent the cable 301 from being distorted and affecting the measurement. After the measurement, the wire reel 20 is controlled to release the pulling wires on it, and the elastic cord 22 resets to drive the combing blocks 21 to slide back to their original positions in the reverse direction.

[0043] Embodiment 3: On the basis of Embodiment 2, as Figure 10As shown, it further includes a positioning rod 23, which is fixedly connected to the left part at the rear side of the lower caliper 3. The positioning rod 23 points to the scale line of the measuring plate 5, and the positioning rod 23 facilitates the tester to directly observe the original length of the cable 301.

[0044] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited by the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A test device for detecting the tensile characteristics of a cable, comprising a stretching machine (1), a sliding plate (2) is slidably connected to the stretching machine (1), the stretching machine (1) automatically controls the sliding of the sliding plate (2) through its internal control system, and clamping jaws (3) for fixing both ends of the cable to be tested (301) are fixedly connected to both the stretching machine (1) and the sliding plate (2), characterized in that, The stretching machine (1) is fixedly connected with fixing rods (4) symmetrically distributed along the stretching machine (1). A measuring plate (5) is slidably connected between the symmetrically distributed fixing rods (4). Scale lines for measuring the length of the cable (301) are marked between the two ends of the measuring plate (5). Initially, only one end of the cable (301) is aligned with the end scale line of the measuring plate (5). A groove is formed on one side of the measuring plate (5) close to the scale line. A laser length measuring sensor (501) for measuring the length between the break points of the cable (301) is fixedly connected to the middle of the measuring plate (5). A force-bearing frame (6) is slidably connected to the stretching machine (1) and is used to push the measuring plate (5) to move towards the cable (301) side after the cable (301) is stretched. A skateboard (2) is slidably in contact with the force-bearing frame (6). A first spring (7) is fixedly connected between the fixing rod (4) and the measuring plate (5). A transparent support plate (8) is arranged in the groove of the measuring plate (5), and the support plate (8) is used to support the cable (301).

2. The testing device for detecting the tensile characteristics of a cable according to claim 1, characterized in that the measurement The measuring plate (5) is provided with inclined holes symmetrically distributed along the measuring plate (5), and the measuring plate (5) is slidably connected with the force-bearing frame (6) through the inclined holes on it.

3. The testing device for detecting the tensile characteristics of a cable according to claim 2, wherein It further includes a pulling frame (9). The pulling frame (9) is slidably connected with the measuring plate (5). The pulling frame (9) is fixedly connected with the support plate (8). A magnetic plate (10) is slidably connected to the pulling frame (9). The magnetic plate (10) moves under the extrusion of the cable (301). A reset member for resetting the support plate (8) after the laser length measuring sensor (501) completes length measurement is arranged on the caliper (3) on the side close to the skateboard (2).

4. A test device for detecting the tensile characteristics of a cable according to claim 3, characterized in that, The reset member is set as magnetic blocks (11) symmetrically distributed along the magnetic plate (10). The magnetic blocks (11) are fixedly connected to the caliper (3) on the side close to the skateboard (2), and the magnetic blocks (11) are magnetically coupled with the magnetic plate (10).

5. A test device for detecting the tensile characteristics of a cable according to claim 4, characterized in that, It further includes friction blocks (12) symmetrically distributed along the measuring plate (5). The friction blocks (12) are slidably connected with the measuring plate (5). The friction blocks (12) are in frictional cooperation with the pulling frame (9). A compressed second spring (13) is fixedly connected between the friction blocks (12) and the measuring plate (5).

6. A test device for detecting the tensile characteristics of a cable according to claim 5, characterized in that, It further includes fixing plates (14) symmetrically distributed along the measuring plate (5). A transparent limiting plate (15) is rotatably connected between the symmetrically distributed fixing plates (14). A torsion spring (16) is fixedly connected between the fixing plate (14) and the limiting plate (15). A pulling plate (17) and an L-shaped pull rod (18) are slidably connected to the measuring plate (5). The pulling plate (17) and the L-shaped pull rod (18) are slidably connected. The pulling plate (17) contacts the limiting plate (15). The L-shaped pull rod (18) moves and contacts the force-bearing frame (6). A tension spring (19) is fixedly connected between the L-shaped pull rod (18) and the measuring plate (5).

7. A test device for detecting the tensile characteristics of a cable according to claim 6, characterized in that, The side of the pulling plate (17) close to the L-shaped pull rod (18) is provided with inclined holes symmetrically distributed along the L-shaped pull rod (18), and the pulling plate (17) is slidably connected with the L-shaped pull rod (18) through the inclined holes on it.

8. A test device for detecting the tensile characteristics of a cable according to claim 7, characterized in that, It further includes a wire winder (20), the wire winder (20) is fixedly connected to the limit plate (15), wire pulling ropes symmetrically distributed along the wire winder (20) are fixedly connected to the wire winder (20), the limit plate (15) is slidably connected with carding blocks (21) symmetrically distributed along the limit plate (15), the carding blocks (21) are fixedly connected to the wire pulling ropes adjacent to the wire winder (20), and an elastic cord (22) is fixedly connected between the carding blocks (21) and the limit plate (15).

9. A test device for detecting the tensile characteristics of a cable according to claim 8, characterized in that, It further includes a positioning rod (23), the positioning rod (23) is fixedly connected to the caliper (3) on the side close to the sliding plate (2), the positioning rod (23) points to the scale line of the measuring plate (5), and the positioning rod (23) is used to visually observe the original length of the cable wire (301).

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